The five-piece have promised fans they will reform at the end of 2012 to celebrate the career milestone, but Sarah Harding has now revealed that they have yet to decide on how they will do it.
"The latest is that we'll be doing something for our anniversary, but we're not exactly sure what yet. We're still in talks," Harding told Look magazine.
"Our 10th birthday is in November, so I guess it will be then. We want to create something really special for it, so we're not rushing it.''
Harding admitted that the group enjoy meeting up to discuss their career so far because they get "nostalgic" about the achievements and experiences they've had.
"It's magic. We just talk about funny stuff that used to happen to us and have a giggle about things we've experienced," she said.
''It was a great time and we're all nostalgic. We're like sisters because we worked together 24/7 when we were promoting or in the studio. But it's quite nice to have a break, otherwise you can have too much of a good thing.''
Harding recently confirmed that she will release a solo record next year, but failed to give any further details about the project.
Watch the music video for Girls Aloud's 'No Good Advice' below: